I purchased a ev with a bad boy charger.
It has a hammond tranformer (parallel connection), diode bridge retifier and large resistor on the 120 volt side and appears to work fine (120 vdc out). Except that the EV has 12 batteries which I assume would need 144 volts out.
The 240 side has additional components pior to the Hammond (they look like additonal smaller inductors), a with series connection to transformer. The 240 side is blowing fuses. Not sure what output voltage? any ideas?